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Water 2018, 10(9), 1212; https://doi.org/10.3390/w10091212

Calculation of Comprehensive Ecological Flow with Weighted Multiple Methods Considering Hydrological Alteration

1
School of Water Conservancy & Civil Engineering, Northeast Agricultural University, Harbin 150030, China
2
The Key Laboratory of High Efficient Utilization in Agricultural Water Resources of Ministry of Agriculture of China, Harbin 150030, China
*
Author to whom correspondence should be addressed.
Received: 18 July 2018 / Revised: 16 August 2018 / Accepted: 31 August 2018 / Published: 7 September 2018
(This article belongs to the Section Hydrology)
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Abstract

Instream ecological flow is an essential determinant of river health. Intra- and interannual distribution characteristics of runoff have been altered to different degrees by dam construction. Historical runoff series with alterations, as basic data for ecological flow calculation, provide minimal instream hydrological process information, which affects the credibility of calculation results. Considering the influence of the alterations in runoff series on ecological flow calculation, the Gini coefficient (GI) is introduced to study the evenness degrees of the intra-annual runoff distribution of four hydrological stations located in the Naolihe basin of the Sanjiang Plain. The hydrological alteration diagnosis system is used to examine the alteration points in the GI series of each hydrological station for selecting reasonable subsequences. Based on the selected subsequences, the ecological flow of each station is calculated using three hydrological methods, and the comprehensive ecological flow is calculated using weighted calculation results from the three hydrological methods. The study results show that ecological flow and natural flow have similar processes with two peaks occurring in the process in May and August, respectively. Also, dams decrease the ecological water requirement damage frequency in dry seasons, but overuse of water resources increases the ecological water requirement damage frequency in flood seasons. View Full-Text
Keywords: Gini coefficient; hydrological alteration diagnosis system; weighted multiple methods; ecological flow Gini coefficient; hydrological alteration diagnosis system; weighted multiple methods; ecological flow
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Xing, Z.; Wang, Y.; Gong, X.; Wu, J.; Ji, Y.; Fu, Q. Calculation of Comprehensive Ecological Flow with Weighted Multiple Methods Considering Hydrological Alteration. Water 2018, 10, 1212.

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